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Influence of nitric acid and plutonium concentrations in dissolver solution of mixed oxide fuel on decontamination factors for uranyl nitrate hexahydrate crystal

硝酸ウラニル六水和物結晶の除染係数に及ぼす混合酸化物燃料溶解液中の硝酸及びプルトニウム濃度の影響

中原 将海; 野村 和則 ; 鷲谷 忠博 ; 近沢 孝弘*; 平沢 泉*

Nakahara, Masaumi; Nomura, Kazunori; Washiya, Tadahiro; Chikazawa, Takahiro*; Hirasawa, Izumi*

U晶析プロセスにおけるPu及び核分裂生成物の除染挙動を調べるため、混合酸化物燃料溶解液を用いた試験を実施した。Euは硝酸ウラニル六水和物結晶の洗浄操作において除染できることが確認された。しかしながら、BaとCsの除染係数は低かった。これはU晶析プロセスにおいてBa(NO$$_{3}$$)$$_{2}$$とCs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$としてそれぞれ析出することが原因と考えられる。Csの除染係数は、HNO$$_{3}$$及びPu濃度が増加するに従い減少することがわかった。この原因は、Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$の生成によるものと推察された。

In order to examine the decontamination behavior of the Pu and fission products in the U crystallization process, experiments were carried out using mixed oxide fuel dissolver solution. It is confirmed that Eu was decontaminated by washing the uranyl nitrate hexahydrate crystals. However, the decontamination factors of Ba and Cs were low because they precipitated as Ba(NO$$_{3}$$)$$_{2}$$ and Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ after the U crystallization, respectively. The decontamination factor of Cs tends to decrease with increasing HNO$$_{3}$$ and Pu concentrations in the mother liquor because of the generation of Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$.

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パーセンタイル:43.83

分野:Chemistry, Inorganic & Nuclear

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